n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 520: | \[520!!!!-1\] | 463 × 527099 × 10776463 × 26938209887<11> × 65244762623559327749<20> × [2591959525541063282145371184118605418608425613848330132542311628117290837430317104693929684150551522629866820304640405150328317493145339468239593468141483094369119180230858146037376359035420131758047955480252717546478810532770361091498749719063165890583<253>] |